Safeguards against accidental drag and drop in the Device Tree

Totally agree that this feature is required.
A lock property on the group that prevents moving would be ideal.
We have had operational issues caused by accidental movement of groups, which then cause Dashboards and Alert rules to fail. The movement can sometimes be in place for a while before noticed.
I would recommend this is implemented as soon as possible as it undermines the reliability of the product in senior management's eye.